| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | happen to be | 1101 |
|
| 2 | happened to be | 441 |
|
| 3 | happens to be | 368 |
|
| 4 | happen to be | 243 |
|
| 5 | happen to be | 34 |
|
| 6 | happened to be | 13 |
|
